Manga Everyone's Loose Screw

Junior high school student Misaki Nanao realizes the people of the town she lives in are slowly going insane. At the same time, she starts seeing Beherin, a mysterious demon. “If you make me believe you, I shall help you”. Misaki believes the demon’s words and talks about her terrifying personal experiences; however she gets dragged into people’s increasing insanity, horrific incidents and a huge conspiracy.